The idea is to demonstrate how silly it is to be investing in growing plants in our urban environments, and yet not use those plants to provide multiple benefits to the populations that live there. But more than that, they say, they are setting out to "undo civilization, one branch at a time", with the ultimate aim of turning city streets into food forests—although they may have a long way to go before they can match this 2000-year-old food forest in Morocco.